Is his child actually his blood? He is the daddy irregardless of what the test says but is it possible for being tested negative for having trait and the mother be tested with trait to have a child with the full-blown sickle cell disease? If I had answered this a month ago it would be a whole other comment or response. But being that I just found out officially that my father has trait and he was tested as negative as well when I was little it makes you wonder. So what are you guys think?